Industrial Quality Signmaking, Lettering, V Groove Miter Fold are made by Amana Tool, the leading manufacturers of high-quality wood-cutting tools. Use Amana Tool 45783 Solid Carbide Carving Liner 18 Deg x 1/4 D x 5/8 CH x 1/4 SHK x 2-1/2 Inch Long Single Flute Router Bit for extra-fine carving and lettering details. Excellent for: Aluminum, Brass, MDF/Laminates, Plywood, Silver, Wood. SPECIFICATIONS: Diameter (D): 1/4; Angle (a): 18; Cutting Height (B): 5/8; Shank (d): 1/4; Overall Length (L): 2-1/2; Flutes: 1.